Novel sequencing batch dissolved air flotation solid-liquid separation system

Abstract

The invention provides a novel sequencing batch dissolved air flotation solid-liquid separation system which comprises a tubular reactor. A tubular mixer is mounted at the front end of the tubular reactor, the front end of the tubular mixer is connected with one end of a water inlet pipe, the other end of the water inlet pipe is connected with a reagent feeding valve and a water inlet valve through a tee joint, the other end of the water inlet valve is connected with a raw water pump, and the rear end of the tubular reactor is connected with a bottom water inlet of an air flotation separation tank. A plurality of perforated water outlet pipes are arranged on the inner lower half portion of the air flotation separation tank, a plurality of rows of water outlet holes are formed in the surfaces of the perforated water outlet pipes, one end of each perforated water outlet pipe is sealed, and the other end of each perforated water outlet pipe is connected with a water outlet valve outside the air flotation separation tank. The novel sequencing batch dissolved air flotation solid-liquid separation system has the advantages that the air flotation separation tank is independently arranged, water flow rises or is static when scum rises, separation efficiency is high, separation effect is good, micro-bubble and coagulation floc copolymerization environments are created, conditions are created for co-coagulation flotation, separation is more sufficient, and the system is not easy to block.

Description

technical field [0001] The invention relates to a solid-liquid separation device for sewage treatment, in particular to a new sequence batch type dissolved air flotation solid-liquid separation system with simple and reliable overall structure, ingenious design, sufficient reaction, not easy to be blocked, and good separation effect. Background technique [0002] Air flotation technology is an efficient solid-liquid separation technology, which is widely used in the pretreatment of oily, suspended solids, and high-concentration organic wastewater, such as the treatment of wastewater from oil refining, mechanical processing, printing and dyeing, papermaking, and pesticide industries. It is used to remove oil, emulsion and suspended particles whose specific gravity is less than or close to 1 in wastewater. Compared with the sedimentation method, the separation efficiency of the air flotation method is high, and the separation capacity of the air flotation method is about 4 to ...

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Problems solved by technology

[0004] However, the traditional dissolved air flotation method has the following disadvantages: (1) In the separation area, the air bubbles adhere to the pollutants and flow upward, while the treated water flows downward, which is greatly affected by the hydraulic conditions and the quality and quantity of raw water, and the operation is unstable. The effect is much lower than the theoretical effect; (2) The traditional dissolved air flotation adopts the narrow and complicated flow path of the dissolved air releaser, which is very easy to block. Although many releasers have flushing measures, the effect is generally not ideal; (3) The traditional dissolved air flotation reaction tank, contact area and separation area are set up separately, occupying a large area; (4) The traditional dissolved air flotation reaction tank is designed according to the design parameters of the sedimentation tank or has no reaction tank, which does not meet the requirements of the air flotation process. response request

In short, traditional dissolved air flotation is greatly affected by hydraulic conditions and raw water quality and quantity, the releaser is easy to block, the degree of reaction is unreasonable, the operation is unstable, and the separation effect is relatively poor

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